Arboricultural Report from STP24-0253 Application for Operational Works Fire Trail - 80 Cooyar Street Noosa Heads · OPW24/0118

Figure 35 below shows a typical representation of a tree protection system. Tree’s root
systems are generally shallow with most of the roots found within the top 1m of soil with a
higher density of roots found closest to the surface where moisture and nutrients are more
readily available. The function of the TPZ (Tree Protection Zone) is to ensure that the tree has
a viable root system, so the tree has a functional future as an amenity asset within the
development.

The structural standing of a tree is linked to critical aspects of roots (found in the TPZ) to bind
the soil and create a mass that the tree can anchor to. These roots consist of ‘Secondary roots’
(medium size) and ‘Tertiary roots’ (small size).

Primary roots (large size) found in the SRZ connect the Tree to the anchor system. Primary
roots by themselves do not bind enough soil to create a stable anchor system.

The shallow nature of tree roots should be taken into consideration when working close to
trees and when installing the tree protection fencing for the Tree Protection Zone (TPZ).




                      Figure 35: Example of an ideal generic Tree Protection System



8.3.1 TPZ Signs
The signs, sample to be found at Appendix 2 – Sample TPZ Sign, identifying the TPZ are to
be placed around the edge of the TPZ in locations visible to the site as per Tree Protection
Fencing Standards Australia marketing media AS4970 – 2009.




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